A cartridge access device in a cartridge storage system is designed to retrieve a cartridge from a storage device and to transfer the cartridge to a particular location within the system. Once the cartridge is no longer needed at the particular location, the cartridge access device retrieves the cartridge from the particular location and returns the data cartridge to the storage device. The data cartridge device preferably includes at least two engaging members that engage a respective surface of a frame assembly. channels in the surfaces of the frame assembly guide the engaging members and, therefore, the cartridge access device as the cartridge access device moves. The engaging members are engaged with a respective conductive track member that extends through the channels in the frame assembly. Electrical current is passed through the conductive track members and the engaging members to the cartridge access device in order to supply the cartridge access device with electrical power and/or to communicate control signals to the cartridge access device. Therefore, a power cable and/or a control cable does not have to be physically connected to the cartridge access device in order for the components on the cartridge access device to receive electrical power and/or control signals.
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15. A method for transferring cartridges, comprising the steps of:
receiving a cartridge in a cartridge access device; moving said cartridge access device relative to a frame assembly, said frame assembly having a surface; engaging a conductive brush with a conductive member extending across said surface of said frame assembly, said conductive brush coupled to said cartridge access device and to a spring; and sliding said conductive brush across said conductive member during said moving step.
6. A system for transferring cartridges, comprising:
means for accessing a cartridge and for transferring said cartridge to another location, said cartridge access device having a conductive brush for receiving electrical current; means for engaging said brush with a conductive member, wherein said engaging means includes a spring for generating a force that pushes said brush toward said conductive member; and means for sliding said brush over a surface of said conductive members as said cartridge access device moves.
13. A system for transferring cartridges, comprising:
a frame assembly having a surface; a conductive member extending across said surface of said frame assembly; a cartridge access device for receiving a cartridge and moving relative to said frame assembly; a conductive brush coupled to said cartridge access device and engaged with said conductive member; and a spring coupled to said conductive brush, wherein said conductive brush slides across said conductive member as said cartridge access device moves relative to said frame assembly.
1. A system for transferring cartridges, comprising:
a cartridge access device configured to receive a cartridge and configured to transfer said cartridge to another location; a conductive brush coupled to said cartridge access device; a frame assembly having a channel and a power track, wherein said power track extends through said channel; and a rod coupled to said brush and configured to engage said brush with said power track such that said brush slides over a surface of said power track as said cartridge access device moves, and such that said brush is guided through said channel.
9. A system for transferring cartridges, comprising:
a frame assembly having a surface in a groove; a conductive member extending through said groove; a cartridge access device for receiving a cartridge and moving relative to said frame assembly; an engaging member coupled to said cartridge access device, said engaging member engaged with said surface; and a conductive brush coupled to said cartridge access device and engaged with said conductive member of said groove, wherein said conductive brush slides across said conductive member as said cartridge access device moves relative to said frame assembly.
2. The system of
3. The system of
a power wire configured to transmit an electrical signal to said cartridge access device via said brush and said power track; and a filter configured to recover a control signal from said electrical signal such that a power signal is filtered from said electrical signal.
7. The system of
8. The system of
means for transmitting an electrical signal to said cartridge access device via said brush and said conductive member; and means for recovering a control signal from said electrical signal, wherein said recovering means includes a means for filtering a power signal from said electrical signal.
10. The system of
11. The system of
a control unit for controlling movement of said cartridge access device based on a control signal, said control unit coupled to and residing on said cartridge access device; and a filter for receiving an electrical signal from said conductive brush and for recovering said control signal from said electrical signal, said filter coupled to and residing on said cartridge access device.
12. The system of
means for receiving an electrical signal transmitted from said conductive member to said conductive brush, said receiving means coupled to and residing on said cartridge access device.
14. The system of
a shaft coupled to said cartridge access device, said shaft having a hollow region; and a rod coupled to said brush and to said spring, said rod extending through said hollow region, wherein said spring is engaged with said shaft.
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This is a divisional of copending application Ser. No. 09/143,208 filed on Aug. 28, 1998.
1. Field of Invention
The present invention relates generally to cartridge storage systems for handling and storing cartridges, such as optical disk or magnetic tape cartridges, and more specifically, to a system and method for supplying power and control signals to a movable device (i.e., a cartridge access device) that stores and retrieves cartridges in a cartridge storage system.
2. Related Art
Many different types of cartridge storage and handling systems exist and are being used to store data cartridges (and other types of cartridges) at known locations and to retrieve desired cartridges so that data may be written to and/or read from the data cartridges. Such data storage and handling systems are often referred to as "autochangers" or "juke box" data storage systems, particularly if they accommodate a large number of individual data cartridges.
A typical juke box data storage system includes one or more different types of cartridge-receiving devices for holding the various data cartridges. For example, one type of cartridge-receiving device may comprise a cartridge storage rack or "magazine" while another type of cartridge-receiving device may comprise a cartridge read/write device. The cartridge storage racks or magazines serve to provide storage locations for the data cartridges and are commonly arranged so that they form one or more vertical stacks. The cartridge read/write device may be located adjacent the cartridge stack, although the cartridge read/write device can be positioned at any convenient location. The data storage system may also include a cartridge access device for accessing the various data cartridges contained in the cartridge-receiving devices and a positioning device for moving the cartridge access device among the cartridge-receiving devices.
If a host computer system issues a request for data contained on a particular data cartridge, a control system associated with the cartridge access device actuates the positioning system to move the cartridge access device along the cartridge storage rack until the cartridge access device is positioned adjacent the desired data cartridge. The cartridge access device then removes the data cartridge from the cartridge storage rack and carries it to the cartridge read/write device. The cartridge access device inserts the selected data cartridge into the cartridge read/write device so that the host computer may thereafter read data from or write data to the data cartridge. After the read/write operation is complete, the cartridge access device removes the data cartridge from the read/write device and returns it to a specified location in the cartridge storage rack.
Most cartridge access devices have components that require both power and control signals. For example, the positioning system that moves the cartridge access device to the appropriate location usually requires power and control signals in order to appropriately move the cartridge access device.
A simple technique for providing the power and control signals to the cartridge access device is to connect a power cable and a control cable to the cartridge access device, as is commonly done in the prior art. The power cable supplies the components of the cartridge access device with power, and the control cable provides the cartridge access device with control signals for proper operation. Both the power cable and the control cable can be tied together or integrated into a single cable.
However, if the cables are not properly secured, the cables can interfere with the motion of the cartridge access device. For example, the cables can block the path of movement of the cartridge access device causing the cartridge access device to malfunction or jam. Alternatively, the cables can wrap around the cartridge access device as the cartridge access device moves in different directions, thereby impeding the motion of the cartridge access device or interfering with the retrieval of the data cartridge.
Furthermore, having a cable coupled to the moving cartridge access device can make it more difficult to manufacture and service the data storage system. In this regard, the cable can interfere with efforts to install, remove, and access the cartridge access device and other components in the system. In addition, communicating signals through the cable can adversely emit radio frequency interference (RIF) from the cable. Other problems associated with having a cable coupled to a moving cartridge access device should be apparent to one ordinarily skilled in the art.
Thus, a heretofore unaddressed need exists in the industry for a system and method of providing power and/or control signals to a movable cartridge access device within a data storage system without disrupting the motion of the cartridge access device.
The present invention overcomes the inadequacies and deficiencies of the prior art as discussed herein. Generally described, the present invention provides a system and method for providing power and control signals to a movable device that retrieves and stores cartridges within a cartridge storage system without connecting a power cable to the movable device.
The present invention utilizes a frame assembly, an engaging member, a conductive member, and a cartridge access device. The frame assembly has a channel or groove. The conductive member is attached to a surface of the frame assembly and extends through the channel of the frame assembly. The cartridge access device receives and transports cartridges from one location within the cartridge storage system to another location within the cartridge storage system. The first engaging member is coupled to the cartridge access device and engaged with the conductive member. The engaging member is conductive so that electrical signals can be passed between the engaging member and the conductive member attached to the frame assembly.
In accordance with another feature of the present invention, the engaging member includes a shaft, a brush, a rod, and a spring. The brush is coupled to the rod which is inserted into a hole in the shaft. The spring is coupled to the rod and engaged with the shaft so that a force generated by the spring tends to push the brush away from the shaft and toward the conductive member. Due to the force generated by the spring, the brush engages the conductive member and maintains contact with the engaging member (i.e., slides across a surface of the engaging member) as the cartridge access device moves.
In accordance with another feature of the present invention, control signals are superimposed on a power signal that is supplied to the cartridge access device via the conductive member and the engaging member. A filter is designed to filter out the power signal from the control signals so that the control signals can be recovered and utilized by the cartridge access device in order to operate the components of the cartridge access device.
The present invention can also be viewed as providing a method for transferring data cartridges within a data storage system. Briefly described, the method can be broadly conceptualized by the following steps: inserting a cartridge associated with the cartridge storage system into a cartridge access device; moving the cartridge access device; sliding a brush coupled to the cartridge access device across a surface of the conductive member during the moving step; and supplying the cartridge access device with electrical power via the brush and the conductive member.
The present invention has many advantages, a few of which are delineated hereafter, as mere examples.
An advantage of the present invention is that electrical power can be supplied to components of a cartridge access device within a data storage system without connecting a power cable to the cartridge access device.
Another advantage of the present invention is that control signals can be supplied to the cartridge access device without connecting a control cable to the cartridge access device.
Another advantage of the present invention is that the cartridge access device can move through the data storage system without interference from a power cable or a control cable.
Another advantage of the present invention is that radio frequency interference (RIF) associated with a cartridge storage system can be reduced.
Another advantage of the present invention is that the cartridge access device with the cartridge storage system can be easier to access and to install.
Other features and advantages of the present invention will become apparent to one skilled in the art upon examination of the following detailed description, when read in conjunction with the accompanying drawings. It is intended that all such features and advantages be included herein within the scope of the present invention, as is defined by the claims.
The invention can be better understood with reference to the following drawings. The elements of the drawings are not necessarily to scale relative to each other, emphasis instead being placed upon clearly illustrating the principles of the invention. Furthermore, like reference numerals designate corresponding parts throughout the several views.
A cartridge storage system 10 according to the present invention is shown in FIG. 1 and may include a cartridge handling system 12 for transferring cartridges 14 between one or more cartridge-receiving devices, such as one or more cartridge storage racks or magazines 16 and one or more cartridge read/write devices 18. Although different types of cartridges 14 are possible, the present invention will be described for illustrative purposes where the cartridges 14 are data cartridges. However, the term "cartridge" is not limited to data cartridges and is defined as a movable unit of equipment designed to fit into a larger piece of equipment. For example, the cartridges 14 can comprise a vile of fluid to be transported in a testing laboratory.
Although other configurations are possible, the various cartridge-receiving devices (e.g., the cartridge storage racks or magazines 16 and the cartridge read/write devices 18) may be positioned at various locations around the cartridge handling system 12 so that they define the generally U-shaped configuration shown in FIG. 1. Accordingly, the cartridges 14 may be accessed from three (3) cartridge access planes 41,43, and 45.
The cartridge handling system 12 is shown in more detail in FIG. 2 and may comprise a frame assembly 26 which includes a lower or base plate 28 and an upper or top plate 30 that are held in generally parallel, spaced-apart relation by a support structure 47. The frame assembly 26 of the cartridge handling system 12 may define a first cartridge access side 20, a second cartridge access side 22, and a third cartridge access side 24. The first and third cartridge access sides 20 and 24 may be positioned in generally spaced-apart relation, whereas the second cartridge access side 22 may be oriented generally transverse to the first and third cartridge access sides 20 and 24. The various cartridge-receiving devices may be positioned around the cartridge handling system 12 so that the cartridge access planes 41, 43, and 45 (
The lower plate 28 of frame assembly 26 may include a lower U-shaped guide member or channel 32 that forms a substantially continuous member along the first, second, and third cartridge access sides 20, 22, and 24 of the frame assembly 26. Similarly, the upper plate 30 may include an upper U-shaped guide member or channel 34 (
The cartridge handling system 12 (
Although other actuation systems are possible, the cartridge access device 36 is preferably moved along the lower and upper guide members 32 and 34 (i.e., following the U-shaped path 40) by an actuator system 42, as depicted in
In operation, the cartridge storage system 10 according to the present invention may be used to transfer a plurality of cartridges 14 between the various cartridge-receiving devices (e.g., cartridge storage racks or magazines 16 and the cartridge read/write devices 18) positioned adjacent the first, second, and third cartridge access sides 20, 22, and 24. Therefore, the cartridge storage system 10 may be used by a computer system 53 (FIG. 7), for example, or other data processing system to store and access data contained in the cartridges 14.
In this regard, the computer system 53 preferably includes control logic 54 that determines when data should be stored on or read from a particular cartridge 14. The control logic 54 of the computer system 53 can be implemented in software, hardware, or a combination thereof. In the preferred embodiment, as illustrated by way of example in
The preferred embodiment of the computer system 53 of
The computer system 53 also preferably includes a communications device 77' (
In the preferred embodiment the wireless signals are optical signals (e.g., infrared signals) and the communications device 77' (and optical communications device 77", as discussed later) are optical communications devices. However, other types of wireless signals can be communicated between communications devices 77' and 77", in which the communications devices 77' and 77" should be configured to be compatible with the types of signals being communicated. Since the signals are optical in the preferred embodiment, communications devices 77' and 77" will be discussed hereinafter as "optical" communications devices 77' and 77", for illustrative purposes. However, one skilled in the art should realize that communications devices 77' and 77" should be compatible with the type of wireless signals being communicated in the present invention.
A control system 81 (
The preferred embodiment of the computer system 85 of
Consider, for example, an initial condition wherein the desired cartridge 14 is stored in one of the cartridge storage racks or magazines 16 (FIG. 1). Upon receiving a request for the cartridge 14 from the computer system 53 (FIG. 7), the control system 81 (
When the cartridge 14 is no longer needed, the control system 81 (
Having briefly described the cartridge storage system 10 according to the present invention, the various embodiments of the cartridge storage system 10 will now be described in detail. However, before proceeding with the detailed description, it should be noted that while the cartridge storage system 10 is shown and described herein as it could be used to store and retrieve magnetic cartridges 14 having a certain size and configuration (e.g., DLT or digital linear tape cartridges), it is not limited to any particular type of data cartridge. Indeed, the cartridge storage system 10 according to the present invention can be used with any type of data storage device comprising any type of data storage medium (e.g., magnetic disk or tape, optical disk, etc.). Consequently, the present invention should not be regarded as limited to use with the particular type and style of cartridge 14 shown and described herein.
Referring back to
In one preferred embodiment, the cartridge handling system 12 may comprise a generally rectangularly shaped structure having a first cartridge access side 20, a second cartridge access side 22, and a third cartridge access side 24. As used herein, the term "cartridge access side" refers to any side of the cartridge handling system 12 from which cartridges 14 may be accessed, either from a cartridge storage rack or magazine 16 or a cartridge read/write device 18.
The cartridge handling system 12 defines the general arrangement of the cartridge access planes associated with the cartridge-receiving devices (e.g., the cartridge storage racks or magazines 16 and the cartridge read/write devices 18). That is, the cartridge-receiving devices should be arranged around the cartridge handling system 12 so that the cartridge access planes defined by the cartridge-receiving devices are located at positions adjacent the cartridge access sides of the cartridge handling system 12. For example, in one preferred embodiment, the various cartridge-receiving devices (e.g., the cartridge storage racks or magazines 16 and cartridge read/write devices 18) are arranged around the cartridge handling system 12 so that first cartridge access plane 41 is positioned adjacent the first cartridge access side 20, the second cartridge access plane 43 is positioned adjacent the second cartridge access side 22, and the third cartridge access plane 45 is positioned adjacent the third cartridge access side 24.
In accordance with the forgoing considerations, the various cartridge-receiving devices (e.g., the cartridge storage racks or magazines 16 and the cartridge read/write devices 18) may be located adjacent any cartridge access side (e.g., 20, 22, and 24) of the cartridge handling system 12 in any of a variety of arrangements. For example, in one preferred embodiment, two cartridge storage racks or magazines 16 are located adjacent the first cartridge access side 20 of the cartridge handling system 12, whereas another pair of magazines 16 are located adjacent the third cartridge access side 24. A pair of cartridge read/write devices or "drives" 18 are located adjacent the second cartridge access side 22 of the cartridge handling system 12. Alternatively, a different number of cartridge storage racks 16 could be provided, or the cartridge read/write devices 18 could be located adjacent either or both of the first or third cartridge access sides 20 and 24.
The U-shaped arrangement of the cartridge storage magazines 16 and cartridge read/write devices 18 just described and shown in
Referring to
For example, instead of being positioned at substantially right angles to one another, the various cartridge access sides 20, 22, and 24 could be positioned so that they form oblique (i.e., non-perpendicular) angles with respect to one another, such as would be the case if the frame assembly 26 comprised a pentagonal (5-sided) or hexagonal (6-sided) configuration. In still another alternative, the cartridge access sides 20, 22, and 24 need not comprise straight segments, but could instead comprise curvilinear segments or portions, such as may be the case if the frame assembly 26 were provided with a circular or semi-circular cross-section. Consequently, the present invention should not be regarded as limited to a frame assembly 26 having cartridge access sides 20, 22, and 24 arranged according to the geometrical configurations shown and described herein.
Referring to
The upper plate 30 is essentially identical to the lower plate 28 just described and may comprise a plate-like, generally rectangular member having an upper U-shaped guide member or channel 34 therein. The upper U-shaped guide member 34 may include first and third elongate sections 168 and 170 that are located adjacent the respective first and third cartridge access ends 20 and 24. See FIG. 3. The upper guide member or channel 34 may also include a second elongate section (not shown) located adjacent the second cartridge access side 22. The second elongate section (not shown) of the upper guide member or channel 34 is connected to the first and third elongate sections 168 and 170 by respective rounded corner sections (not shown) in a manner essentially identical to those of the lower guide member 32 in the lower plate 28.
The lower and upper plates 28 and 30 may be made from any of a wide range of materials, such as metals or plastics, suitable for the intended application. By way of example, in the preferred embodiment, the lower and upper plates 28 and 30 are molded as single pieces from a polycarbonate plastic material, although other materials could also be used. The lower and upper guide members or channels 32 and 34 formed within the lower and upper plates 28 and 30 may have any of a wide range of widths and depths suitable for the intended application. In the preferred embodiment, both lower and upper guide channels 32 and 34 have widths of about 7.16 mm and depths of about 6.0 mm.
The support structure 47 for holding the lower and upper plates 28 and 30 in essentially parallel, spaced-apart relation may be made from any of a wide range of materials, such as metals or plastics, suitable for the intended application. In the preferred embodiment, the support structure 47 is fabricated from sheet metal and is secured to the lower and upper plates 28 and 30 by any convenient fastener system or device (e.g., screws).
Referring to
Regardless of the particular type of style of cartridge engaging assembly or "picker" that is utilized in the cartridge access device 36, the cartridge access device 36 may be mounted to the lower and upper U-shaped guide members 32 and 34 so that the cartridge access device 36 may be moved along the first, second and third cartridge access sides 20, 22, and 24 generally following the U-shaped path 40. See FIG. 1. More specifically, the cartridge access device 36 may be retained in the lower U-shaped guide member or channel 32 by a pair of lower engaging members 174 and 176 that extend from the bottom of the cartridge access device 36. In one preferred embodiment, the lower engaging member 174 may be attached to a shaft 182 that may be mounted to the cartridge access device 36. Alternatively, other mounting arrangements could be used to attach the lower engaging member 174 to the cartridge access device 36, as would be obvious to persons having ordinary skill in the art. The lower engaging member 176 may be attached to the end of the lower pinion 48, in the manner depicted by
The top of the cartridge access device 36 may be provided with a pair of upper engaging members 186 and 188 that are sized to be slidably received in the upper U-shaped guide member or channel 34. The upper engaging member 186 may be mounted to the top of the cartridge access device 36. The upper engaging member 188 may be mounted to the end of the upper pinion 50, or may even comprise an integral portion of the upper pinion 50. The lower and upper engaging members 174, 176, 186, and 188 guide the cartridge access device 36 along the lower and upper guide members 32 and 34 associated with the lower and upper plates 28 and 30. Finally, the bottom of the cartridge access device 36 may be provided with a guide wheel 190 (
Except as described hereinafter, the lower and upper engaging members 174, 176, 186, and 188 may be made from any of a wide range of materials, such as metals or plastics (e.g., copper, brass or nylon), suitable for providing a low friction engagement with the respective lower and upper guide members or channels 32 and 34 in the respective lower and upper plates 28 and 30. In the preferred embodiment, the lower and upper engaging members 174, 176, 186, and 188 have diameters of about 7.01 mm which provides 0.15 mm of clearance between the engaging members and the guide channels, which, as mentioned above, have widths of about 7.16 mm.
In order to eliminate the need to attach a power cable to the cartridge access device 36, at least one of the lower engaging members 174 and 176 and at least one of the upper engaging members 186 and 188 form a brush capable of providing electrical power to the cartridge access device 36. In this regard, the lower engaging members 174 and 176 and the upper engaging members 186 and 188 are preferably engaged with power tracks 201 and 203, respectively, as depicted by FIG. 10. The power tracks 201 and 203 are preferably attached to the lower and upper plates 28 and 30 in channels 32 and 30, respectively, as depicted by
For illustrative purposes, assume that engaging members 174 and 186 are configured to provide power to the cartridge access device 36. Referring to
The rod 205 is preferably coupled to a spring 207. The engaging member 174 or 186 is then inserted into shaft 182, as depicted by FIG. 11B. Preferably, the shaft includes two sections, a larger portion 182' and a smaller portion 182", each portion 182' and 182" having a hole or other type of hollow region. The hole of the larger portion 182' preferably has a diameter or width larger than the diameter or width of the spring 207, and the hole of the smaller portion 182" preferably has a diameter or width smaller than the diameter or width of the spring 207. Furthermore, the engaging member 174 or 186 is preferably inserted into the larger portion 182' of the shaft before being inserted into the smaller portion 182" (i.e., the rod 205 is inserted into the larger portion 182' first), and the rod 205 is preferably inserted into the shaft 182 first (i.e., the rod 205 is inserted into the shaft 182 before the brush 204).
Therefore, when the engaging member 174 or 186 is inserted into the shaft 182 the spring 207 engages the smaller portion 182" of the shaft 182 and is compressed as the engaging member 174 or 186 is inserted further into the shaft 182. Consequently, the spring 207 generates a force on the brush 204 and rod 205 that tends to push the brush 204 away from the shaft 182. As a result, when the engaging members 174 and 186 are engaged with the power tracks 201 and 103, respectively, as depicted by
The rod 205 is preferably comprised of a conductive material in order to allow electrical current to flow through the rod 205. Although other materials are possible, the rod 205 is preferably comprised of brass, since brass is conductive and resistant to fatigue that may be caused by the forces generated on the rod 205 as the cartridge access device 36 moves along the U-shaped path 40.
Preferably, a voltage potential exists between the power tracks 201 and 203. For example, the power track 201 can be configured to maintain a ground voltage, while the power track 203 can be configured to maintain a power voltage (i.e., a voltage different than the ground voltage) or vice versa. Therefore, in the example where the power track 201 maintains the ground voltage, the brush 204 and rod 205 of the upper engaging member 186 supplies the power voltage to the cartridge access device 36, and the brush 204 and rod 205 of the lower engaging member 174 supplies the ground voltage to the cartridge access device 36. In this regard, power wires can be connected to the rods 205 of the upper and lower engaging members 174 and 186, which carry the power to other components in the cartridge access device 36 through techniques known in the art. Since the upper and lower engaging members 174 and 186 provide the electrical power to the cartridge access device 36, a power cable does not need to be attached to the cartridge access device 36 in order to provide power to the components of the cartridge access device 36. Instead, a connection or terminal having one voltage should be connected to power track 201, and another connection or terminal having another voltage should be connected to power track 203.
As described above, the cartridge access device 36 is moved along the lower and upper guide members 32 and 34 by an actuator system 42 (FIGS. 5 and 6). In the preferred embodiment, the actuator system 42 may comprise a rack and pinion drive system having a substantially continuous lower gear rack 44 provided on the lower plate 28 at a position adjacent the lower U-shaped guide member or channel 32. Similarly, a substantially continuous upper gear rack 46 (
Referring now specifically to
The upper gear rack 46 is essentially identical to the lower gear rack 44 just described and may include first and third elongate sections 191 and 195 that are provided on the upper plate 30 at positions adjacent the respective first and third elongate sections 168 and 170 of the upper guide member or channel 34. A second elongate section 93 may be provided on the upper plate 30 at a position adjacent the second elongate section (not shown) of upper guide member 34. The second elongate section 93 of upper gear rack 46 may be connected to the first and third elongate sections 191 and 195 of upper gear rack 46 by respective rounded corner sections 189 and 199. The upper gear rack 46 may therefore comprise a substantially continuous, U-shaped member that extends along substantially the entirety of the upper U-shaped guide member or channel 34.
The lower and upper gear racks 44 and 46 may be made from any of a wide variety of materials, such as metals or plastics, suitable for the intended application. By way of example, in one preferred embodiment wherein the lower and upper plates 28 and 30 are molded from a polycarbonate plastic material, the lower and upper gear racks 44 and 46 are provided as integrally molded portions of the lower and upper plates 28 and 30 (i.e., the lower and upper gear racks 44 and 46 comprise the polycarbonate plastic material). Alternatively, the lower and upper gear racks 44 and 46 may comprise separate components that are then fixedly attached to the lower and upper plates 28 and 30 by any of a wide range of fastening systems or devices (e.g., adhesives, screws, rivets, etc.).
The lower and upper gear racks 44 and 46 may be provided with any convenient tooth pitch suitable for the intended application. In one preferred embodiment, the lower and upper gear racks 44 and 46 may have a tooth pitch of about 32, although other tooth pitches may also be used.
Referring now to
The pinion drive assembly 52 may comprise a motor 25 and a reduction gear assembly 27 mounted within gearbox housing 23. The reduction gear assembly 27 may comprise one or more spur gears for reducing the speed of the motor 25. The drive shaft 15 may be operatively connected to the output pinion 29 of reduction gear assembly by a face gear 31. Alternatively, other types of gear arrangements may be used.
In the preferred embodiment, the reduction gear assembly 27 may be provided with an encoder system (not shown) to monitor the angular position of a selected gear in the reduction gear assembly 27. The angular position of the selected gear provided by the encoder system (not shown) may be used by the control system 81 (
The reduction gear assembly 27 may comprise any of a wide variety of gear reduction systems, such as spur gear reduction systems, well-known in the art. Alternatively, a worm gear reduction system (not shown) could also be used. The motor 25 may comprise a permanent magnet d.c. motor, such as type RS-385PH, available from Mabuchi Motor Corp. of China. Alternatively, other types of motors may be provided. The characteristics of the particular type of motor that is selected will determine the reduction ratio that is provided by the reduction gear assembly 27. As an example, the reduction gear assembly 27 provides a reduction ratio of about 12:1 in the preferred embodiment, although other reduction ratios may be used.
In an alternative embodiment, other types of actuator systems 42 may be used to move the cartridge access device 36 along the lower and upper guide members or channels 32 and 34. For example, a chain or belt drive arrangement could be used to connect the motor 25 and the cartridge access device 36 to move the cartridge access device 36 along the lower and upper guide members or channels 32 and 34. In yet another arrangement, a wire rope or "cable" and pulley arrangement may be used to connect the cartridge access device 36 to the motor 25.
As mentioned above, the cartridge storage system 10 may be provided with a control system 81 (
For example, referring to
In order for the optical communications devices 77' and 77" to be capable of communication independent of the cartridge access device's location along the U-shaped path 40, the cartridge access device 36 preferably includes a conical device 211, as depicted by
In addition, the optical communications device 77" is preferably positioned adjacent to (i.e., directly above) the tip of the conical device 211, as depicted by FIG. 12. The slope of the sides of the conical device 211 directly facing the optical communications device 77' are configured to reflect the light transmitted from the optical communications device 77' into the receiver portion of optical communications device 77", as depicted by FIG. 13. As the cartridge access device 36 moves around the U-shaped path 40, different sides of the conical device 21 la directly face the optical communications device 77' and reflect light into the receiver portion of the optical communications device 77". Therefore, as the cartridge access device 36 moves around the U-shaped path 40, each optical signal transmitted from the optical communications device 77' is reflected into the receiver portion of the optical communications device 77", regardless of the cartridge access device's location on the U-shaped path 40.
It should be noted that in the preferred embodiment the side of the conical device 211 that faces the pinion drive assembly 52 does not directly face the optical communications device 77' at any of the locations along the U-shaped path 40. Therefore, the side of the conical device 211 that does not directly face the optical communications device 77' at any of the locations along the U-shaped path 40 (i.e., the side that faces the pinion device assembly 52 in the preferred embodiment) does not have to be conical, as depicted by
Furthermore, by being located adjacent to the tip of the conical device 211, each optical signal transmitted by the optical communications device 77" is reflected by at least each conical side of the conical device 211 that directly faces the optical communications device 77' at some point as the cartridge access device 36 moves around the U-shaped path 40. Therefore, the optical communications device 77' receives light from each signal transmitted by optical communications device 77" regardless of the cartridge access device's position on the U-shaped path 40, since at least one side of the conical device 211 is directly facing the optical communications device 77' at each position of the cartridge access device 36 along the U-shaped path 40. As a result, communication between the optical communication devices 77' and 77" is maintained as the cartridge access device 36 moves around the U-shaped path 40.
When the control system 81 receives the request from the computer system 53 to retrieve a cartridge 14, the control system 81 translates the request through conventional processing techniques to determine which cartridge 14 should be retrieved. The control system 81 then transmits control signals to actuator system 42. In response to the control signals, the actuator system 42 moves the cartridge access device 36 along the U-shaped path 40 until the cartridge access end 180 of the cartridge access device 36 is located adjacent the appropriate cartridge 14.
For example, if the desired cartridge 14 is stored in one of the cartridge storage racks or magazines 16, then the actuator system 42 in response to the control signals transmitted from the control system 81 moves the cartridge access device 36 until the cartridge access device 36 is directly opposite the selected cartridge 14. The cartridge engaging device or "picker" (not shown) associated with the cartridge access device 36 then engages the cartridge 14 and draws it into the cartridge access device 36. Once the cartridge 14 has been completely drawn into the cartridge access device 36, the actuator system 42 in response to control signals from the control system 81 actuates the pinion drive assembly 52 as necessary to move the cartridge access device 36 to the desired cartridge read/write device 18. Once properly positioned.adjacent the desired cartridge read/write device 18, the cartridge picker (not shown) loads the cartridge 14 into the cartridge read/write device 18. The computer system 53 can be configured to detect the loading of the desired cartridge in the appropriate cartridge read/write device 18, and via optical communications devices 77' and 77", the control system 81 can be configured to transmit a signal indicating that the cartridge 14 has been loaded in the read/write device 18. After determining that the appropriate cartridge 14 has been loaded, the computer system 53 may then read from or write to the cartridge 14 through conventional techniques.
When the cartridge 14 is no longer needed, the computer system 53 via communications devices 77' and 77" preferably notifies the control system 81 that the cartridge 14 should be removed from the cartridge read/write device 18. In response, the control system 81 transmits control signals to the actuator system 42 that causes the cartridge access device 36 to move along the U-shaped path 40 to position the cartridge access device 36 opposite the cartridge read/write device 18 (assuming that the cartridge access device 36 is not already located in the appropriate position). Thereafter, the cartridge picker (not shown) retrieves the cartridge 14 from the cartridge read/write device 18. The cartridge access device 36 then moves along the U-shaped path 40 until the cartridge access device 36 is opposite of the appropriate cartridge storage rack or magazine 16. The picker (not shown) then returns the cartridge 14 to its appropriate location in the cartridge storage racks or magazines 16.
Although, the present invention has been described hereinabove as utilizing optical signals to communicate between the computer system 53 and the control system 81, other communication techniques may be utilized without departing from the principles of the present invention. For example, similar to the juke boxes of the prior art, a cable may be attached from the computer system 53 to the computer system 85 located on the cartridge access device 36 in order to communicate signals between the two system 53 and 85. However, it is preferable to utilize optical communications devices 77' and 77" instead of a cable, because optical communication is less likely to interfere with the motion of the cartridge access device 36.
Another type of communication that may be used without interfering with the motion of the cartridge are high frequency control signals communicated through the engaging members 174 and/or 186 mentioned hereinbefore. In this regard, control signals transmitted from the computer system 53 are preferably combined with the power signal supplied by the power track 201 or 203 through techniques known in the art. Therefore, the control signals are preferably superimposed on the power signal. Power signals are typically low frequency signals (e.g., below approximately 100 Hertz). Consequently, the power signal can be passed through a high-pass filter 213 (
It should be noted that the control signals transmitted to the power track 201 or 203 should have a high enough frequency for the high-pass filter 213 to filter out the power signal without significantly attenuating the control signals. Furthermore, it may be possible to provide the power tracks 201 and 203 with a power signal of a high enough frequency so that the frequency of the control signal can be lower than the frequency of the power signal without affecting the ability to filter the power signal from the combined signal. In this regard, the filter 213 should define a low-pass filter.
By providing the cartridge access device 36 with power via the upper and lower engaging members 174 and 186 and by communicating control signals between the computer system 53 and the control system 81 via optical signals or via the power signal, the need for coupling a cable (i.e., a power cable or a control cable) to the cartridge access device 36 is eliminated. Therefore, the cartridge access device 36 can move along the U-shaped path 40 (or any other desirable path) more freely and without interference from a power cable or a control cable.
It should be noted that although the present invention has been described hereinabove as communicating control signals for operation of the cartridge access device 36 between the optical communications devices 77' and 77", other types of signals communicated between devices 77' and 77" are possible. For example, status signals indicating the status of the cartridge access device 36 or other types of data signals may be communicated between the optical communications devices 77' and 77" without departing from the principles of the present invention.
In concluding the detailed description, it should be noted that it will be obvious to those skilled in the art that many variations and modifications may be made to the preferred embodiment without substantially departing from the principles of the present invention. All such variations and modifications are intended to be included herein within the scope of the present invention, as set forth in the following claims.
Schmidtke, Gregg S., Reasoner, Kelly J., Holmquist, Thomas W., Mueller, Robert L., Ehrlich, Ronald L.
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